Transmitter



BEST f" T. R. PURMAN.

I mmsmmm A APPLICATION .FILED FEB. I2. |918- Patented Mar. 9, 1920.

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THoMAsBQUssiiILL PURMAN, or w'Asiririyierrori, riiiivsv-IANIA-- l '1 'o all wiT- n 'it may concern.'

- Bel iti known that f1, THouAs PURMAN, residing at" lVashington, *inl the county of vl/Vashingtonand Stateof Penn'- VSylvaine, have invented certain-new and useful Improvement-sin Transmitters; and

yI "do hereby declare the y'following to be a full, clear,andfexact description'of the inj vention, Lsuch as willenable others skilled inthe-fartto which -it appertains to make `and use the` same.

My invention relatestotransmitters and `theparticular-objeet is to provide a trans'- mittei' which will beboth accurate and sen-4 sitive,f and I attain'this object =by the addition or substitutionof a mercury cup, de-

tails of which will be more fully described hereinafter. -Y By l means Y of my improved transmitter .the contact between the-` mer-` cury ,and the plunger-pin is practically, electrically and#mechanically'perfect and by its usethe current reachesits maximum value before' the rupture takes place'causing the@ distant relay to ibeproperly magnetized at each contact. F urther; details and advanv tages of the inventionwill begivenfandun# vderstood fromin and Aby the descriptionof pthe inventionwhich will follow-.lv i1 In' the drawings? Figure l, is a-plan view of my *improved transmitter showing the;

general arrangement and construction. Fig.

2,-is an end elevatioii,and Fig. 3, is aside velevation thereof. f;

Similar lettersof reference: indicate corresponding parts in fthe severalffigures of A represents'fthe base of vthe transmitter,

the general contour of which resembles a letter'H. This base proper is providedwith the necessary binding posts and uprights into which are pivotally and` adjustably se- Vcured the required operating levers which will be more. fullyv described hereinafter.

Rigidlysecured to the side of the frame A, l is an upright arm `B, whichfis bent over and inwardly at the top andis provided with an adjustable set screw C. 'The pivotal points D,'and E, of the mainoperating lever F,

restin an: indenture in the basev 'andin the end of this :set screw C.V 'Theinner end of this lever Fis connected to a bar G, the end of which passes through an opening in the end of the lever F, and is .held in placeby means of set-screws.

- f -whichlis cast integralwith or connected `to a The bar Gin turn is `pivotally connectedA to an upright arm H,

f Appli'catm filed February L12,1918.`r s enai Neeieyezi.

horizontal vibrating lever" L which `is Aa'ddi Justably pivotedin uprights J, which are preferably cast integr-ahwithV the base A. Y The lever I," is *forinedfinp two parts 'connected together-by means vof a fiat spring K, and the outer end is provided with a platinum Contact plunger-pin L., the purpose of which willbc more fullydescribed there i l inafter. VSecured to and insulated from the underside ofthe base lA, is ,anoutwardly Vproject-` vingsupporting arm lili, to which 'is' adjustf ably secured a' cup N, containing mercury.` This cui/ris adapted to 'receive the platinunif and Vcontact p l-unger-piiisL,which causes an absolute per-rect Contact'.

The vibrating lever isf provided on the "'oiiter"'lialf with aweight 'which may be y Tmovedin orout onsaid lever, the purpose being'to increase or decrease the rapidityofthe vibrationV Of-said lever and practically` V regulatethe speed [off the opera-tor; A spring Q,fis placedu'ndcr the Vback .half of the vibrating 1lever"I, for` vreturning 'said lever to its normal position whenreleased by the' operator, and Set-screws?, are provided. for thefpurpose of limitingtheinovement of said lever.

` A posty Qi"is fsecui"ed iii'thebas'e'wliich cariv Tries an `adjustable setscrew, into the; end of which -a' platinum point R, which in turn f is adaptedito come into'contact with the operatingl leverr F5 f platinum-'pointnearthejcenter of the l feo A; circuit f'bre'akeizis provided for opening 1 vL ndjclosing the circuit, but is notA claimed as any partbfmy invention, as thisis pro,

vided on all makes of telegraph instruments.

In transmitting messages the dots are made byx-ineans of the plunger-pin in the vend of the Vvibrating levery coming into con` tact with the mercury cup and the dashes in the post Q. 1

By the use ofinyinventioii the ruptureis.

alwaysclean, 'sharp and complete, the sepaf `ration ofthe plunger-pin froin'the mercury between the-rupture andcontact beingV suiiicient to prevent formation of` an' arc and the at each rupture.v

by means of the platinum point'on the main',

operatingrlever coming into contact with the icc platinum point in the` end of the set-screw i :ics

current value falls tov zero yat rupture and- 1`r Y the distantrelays areproperly demagnetized. f 11o` Y By the use of my transmitter'thechar-V `acterof'contact with resulting proper ycurrent' value 'from a given source absolutely eliminates the imperfect signals V(such as are made by the present transmitters) known technically as light, heavy, and splitthese defects being,` due, to" poor contacts, rough contacts points, arcs, etc., with the resultant improper `inegnetizationY and deinegneti.-y Zatioii of the n relays.

and iougliened points, split signals.

the thumb and middle finger. To make dots this lever is pushed to lthe right the thumb,V which causes the vibrating.` lever, through the intermediate connection, to

yf bringtli'e; contact plunger-pin in the end of said leveiifinto Contact with ltire.mercuryin` the cup. yllhe"'vibration of-said lever causes the pin to inove upf and down, making what is called the dots. The niunberzoi' dots made depend upon the length ofv time the main lever isV held in this position. TWhen dashes areto be'inade, `the main lever ispuslied over totlieleft the middleiinger bring lplatiiiuin point on this lever` into eontact ine" j 'i fith the 4platiiiuinpoint inthe screw in; the

l. TheV scribed, consisting ofthebase to which are upper endA of the-post The lever being returned toits normal po ition by the spring S,onbarGr.

Having described myV invention ,wliat claim andtdesire'to secure by ,Letters Patent Sjwf-Q i 5 transmitter shown V.and desecured the necessnry'terniinal posts and up-f rights, the main operating.lever-inovably` Poor contact causes" light signals, poor rupture, heavy signals connected at its inner end with abar which Vin turn is secured to an upright secuiedto j or cast integral with avibrating lever,V which is formed in two sections and con-V nected together ,by means of a flat spring,"

a. platinum plunger-pin secured in the ,Outer lend of saidvibrating lever, together .with

set-screws `for adjusting the several parts.- and limiting` the vertical movement of said: vibrating levi', a springfunderneath the .y

vibrating lever for returning the seine toits normal position, all substantially as set forth. f

A transmitter consisting of' a base to` which are secured the necessary binding' posts and uprights, a main operating lever pivot'ally secured in said frame and inovably connected at its inner end toa bar, which baiiin tui'nvis secured to an upright secured.

to oi'v esstyintegral with a4 vibrating lever, said lever being, formed in two parts and `connected together with afflat sliring, adjusting screws onliniitingthe verticalinove mentV of said lever, a spring foi returning said lever toits nori'nal position, e platninnw plunger-pinsecured inthe end of said lever,v en arm oiyl'everI T connected to the baseandlv extending upwardly and inwardly over the vibrating-i lever-to prevent said leverv from vibrating when ireleised, together 'with' an v arniseciired to `the under sidev of theba'se, v said arm carrying a @up containingmercury,V theplunger-pin in vtlienendoiiY the vibrating lever beingatjlapted toengage with the nier` cuiyiorining a perfect Contact orfeircuitall substantially as and forthe purposesl shownk and described. 4 Y Y Y v Y, v v ln testimony whereof, lhaveherennto-set I iny-h'and in the presence oftwo vi/fitnesses.V .-l riioinis niissnr lVitnesses: ,7. e

MARK M. DECKER, GLENN 1),- CARSON.. 

